you'll find more than a few people on this forum who've decided that they study better on their own, and don't go to any lectures. personally, i don't know how people can possibly do well on exams without attending lecture. who is writing your exams? the author of your textbook or your professor? also, it may be different at your school, but at my school, we get a fat packet of notes for each class, but those notes sometimes have errors and sometimes fail to explain difficult concepts thoroughly (ex. lung mechanics, respiratory physiology). the way i look at it, i could either spend 2 hours teaching myself the concepts, or simply to go lecture and get it done in an hour.
do you mind if i ask you how you've been doing on your exams so far? are you getting high scores? if so, i am surprised and very impressed. to me, lecture is essential.